Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all requirements for effectiveness of this Post-Effective
Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, and State of
New York, on the 4th day of October, 2012.

BlackRock Multi-State Municipal Series Trust

(REGISTRANT)

By:

/s/ John Perlowski

(John Perlowski,

Chief Executive Officer)

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the
Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature

Title

Date

/s/ John Perlowski

(John Perlowski)

Chief Executive Officer (Principal Executive Officer)

October 4, 2012

/s/ Neal Andrews

(Neal J. Andrews)

Chief Financial Officer (Principal Financial and Accounting Officer)

October 4, 2012

JAMES H. BODURTHA*

(James H. Bodurtha)

Trustee

October 4, 2012

BRUCE R. BOND*

(Bruce R. Bond)

Trustee

October 4, 2012

DONALD W. BURTON*

(Donald W. Burton)

Trustee

October 4, 2012

STUART E. EIZENSTAT*

(Stuart E. Eizenstat)

Trustee

October 4, 2012

KENNETH A. FROOT*

(Kenneth A. Froot)

Trustee

October 4, 2012

ROBERT M. HERNANDEZ*

(Robert M. Hernandez)

Trustee

October 4, 2012

JOHN F. OBRIEN*

(John F. OBrien)

Trustee

October 4, 2012

ROBERTA COOPER RAMO*

(Roberta Cooper Ramo)

Trustee

October 4, 2012

DAVID H. WALSH*

(David H. Walsh)

Trustee

October 4, 2012

- 1 -

FRED G. WEISS*

(Fred G. Weiss)

Trustee

October 4, 2012

PAUL L. AUDET*

(Paul L. Audet)

Trustee and President

October 4, 2012

LAURENCE D. FINK*

(Laurence D. Fink)

Trustee

October 4, 2012

HENRY GABBAY*

(Henry Gabbay)

Trustee

October 4, 2012

*By:

/s/ Ben Archibald

October 4, 2012

Ben Archibald (Attorney-In-Fact)

- 2 -

EXHIBIT INDEX

Index No.

Description of Exhibit

EX-101.INS

XBRL Instance Document

EX-101.SCH

XBRL Taxonomy Extension Schema Document

EX-101.CAL

XBRL Taxonomy Extension Calculation Linkbase

EX-101.DEF

XBRL Taxonomy Extension Definition Linkbase

EX-101.LAB

XBRL Taxonomy Extension Labels Linkbase

EX-101.PRE

XBRL Taxonomy Extension Presentation Linkbase

- 1 -

EX-101.INS
3
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0.05272012-05-31<font style="FONT-FAMILY: ARIAL" size="2">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the BlackRock-advised fund complex. More information about these and other discounts is available from your financial professional and in the &#8220;Details about the Share Classes&#8221; section on page 28 of the Fund&#8217;s prospectus and in the &#8220;Purchase of Shares&#8221; section on page II-69 of the Fund&#8217;s statement of additional information.</font>2012-09-250.0010.001<font style="FONT-FAMILY: ARIAL" size="2">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. </font><font style="FONT-FAMILY: ARIAL" size="2">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. </font>BLACKROCK MULTI STATE MUNICIPAL SERIES TRUST<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Investment Strategies of the Fund</i></b></font><font style="font-family: ARIAL;" class="_mt" size="2"><b>As of 12/31/11</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>Average Annual Total Returns</b>485BPOS<font style="FONT-FAMILY: ARIAL" size="2">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. </font>328<font style="FONT-FAMILY: ARIAL" size="2">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: </font><font style="FONT-FAMILY: ARIAL" size="2">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the BlackRock-advised fund complex. More information about these and other discounts is available from your financial professional and in the &#8220;Details about the Share Classes&#8221; section on page 28 of the Fund&#8217;s prospectus and in the &#8220;Purchase of Shares&#8221; section on page II-69 of the Fund&#8217;s statement of additional information. </font>0.07897459992965730.1178210185<font style="FONT-FAMILY: ARIAL" size="2">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. </font>20152137<font style="FONT-FAMILY: ARIAL" size="2">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: </font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Investment Strategies of the Fund</i></b></font><font style="FONT-FAMILY: ARIAL" size="2">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: </font>679725443<font style="FONT-FAMILY: ARIAL" size="2">During the ten-year period shown in the bar chart, the highest return for a quarter was 8.60% (quarter ended September 30, 2009) and the lowest return for a quarter was -6.63% (quarter ended December 31, 2010). The year-to-date return as of June 30, 2012 was 5.27%. </font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. </font>13614316131680<font style="FONT-FAMILY: ARIAL" size="2">800-882-0052</font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Investment Strategies of the Fund</i></b></font><font style="FONT-FAMILY: ARIAL" size="2">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: </font>234654703418<font style="FONT-FAMILY: ARIAL" size="2">During the ten-year period shown in the bar chart, the highest return for a quarter was 8.76% (quarter ended September 30, 2009) and the lowest return for a quarter was &#8211;6.57% (quarter ended December 31, 2010). The year-to-date return as of June 30, 2012 was 5.46%. </font>129134153415900.08760.0870.1362<font style="font-family: ARIAL;" class="_mt" size="2"><b>As of 12/31/11</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>Average Annual Total Returns</b><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Investment Strategies of the Fund</i></b></font><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font><font style="FONT-FAMILY: ARIAL" size="2">800-882-0052</font><font style="FONT-FAMILY: ARIAL" size="2">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: </font><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font>0.0869<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Investment Strategies of the Fund </i></b></font>0.136114356<font style="FONT-FAMILY: ARIAL" size="2">During the ten-year period shown in the bar chart, the highest return for a quarter was 8.64% (quarter ended September 30, 2009) and the lowest return for a quarter was &#8211;6.57% (quarter ended December 31, 2010). The year-to-date return as of June 30, 2012 was 5.35%. </font><font style="FONT-FAMILY: ARIAL" size="2">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: </font>0.0816<font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Shares only, and the after-tax returns for Investor A, Investor B and Investor C Shares will vary. </font>0.11940.0864519652275857189745422650.091420217519252030<font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A1 Shares only, and the after-tax returns for Investor B1 and Investor C1 Shares will vary. </font><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely. </font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Investment Strategies of the Fund</i></b></font><font style="FONT-FAMILY: ARIAL" size="2">800-882-0052</font><font style="FONT-FAMILY: ARIAL" size="1">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund&#8217;s most recent annual report, which does not include Acquired Fund Fees and Expenses. </font><br /><br /><font style="FONT-FAMILY: ARIAL" size="2">During the ten-year period shown in the bar chart, the highest return for a quarter was 9.01% (quarter ended September 30, 2009) and the lowest return for a quarter was -5.50% (quarter ended December 31, 2010). The year-to-date return as of June 30, 2012 was 6.60%. </font><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely. </font><font style="font-family: ARIAL;" class="_mt" size="2"><b>As of 12/31/11</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>Average Annual Total Returns</b><font style="font-family: ARIAL;" class="_mt" size="2"><b>As of 12/31/11</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>Average Annual Total Returns</b></font><font style="FONT-FAMILY: ARIAL" size="2">800-882-0052</font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. </font><font style="FONT-FAMILY: ARIAL" size="2">Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. </font><font style="FONT-FAMILY: ARIAL" size="2">Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. </font><font style="FONT-FAMILY: ARIAL" size="2">Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font><font style="FONT-FAMILY: ARIAL" size="1">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund&#8217;s annual report, which does not include Acquired Fund Fees and Expenses. </font>0.0901<font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A1 Shares only, and the after-tax returns for Investor B1 and Investor C1 Shares will vary. </font><font style="FONT-FAMILY: ARIAL" size="1">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund&#8217;s annual report, which does not include Acquired Fund Fees and Expenses. </font><font style="FONT-FAMILY: ARIAL" size="1">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund&#8217;s annual report, which does not include Acquired Fund Fees and Expenses. </font><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk </i></b>&#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely. </font><font style="FONT-FAMILY: ARIAL" size="2">800-882-0052</font><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely. </font><font style="FONT-FAMILY: ARIAL" size="2">Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font><font style="FONT-FAMILY: ARIAL" size="2">800-882-0052 </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBlackRockNewJerseyMunicipalBondFundClassServiceshareBarChart column period compact * ~</div>
0.08430.08160.13430.1205<font style="FONT-FAMILY: ARIAL" size="2">Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font><font style="FONT-FAMILY: ARIAL" size="1">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund&#8217;s most recent annual report, which does not include Acquired Fund Fees and Expenses. </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBlackRockPennsylvaniaMunicipalBondFundBarChart column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">During the ten-year period shown in the bar chart, the highest return for a quarter was 9.14% (quarter ended September 30, 2009) and the lowest return for a quarter was &#8211;5.44% (quarter ended December 31, 2010). The year-to-date return as of June 30, 2012 was 6.66%. </font><font style="font-family: ARIAL;" class="_mt" size="2"><b>As of 12/31/11</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>Average Annual Total Returns</b><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Shares only, and the after-tax returns for Investor A, Investor B and Investor C Shares will vary. </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBlackRockPennsylvaniaMunicipalBondFundClassServiceSharesBarChart column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">Actual after-tax returns depend on the investor&#8217;s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. </font>0.0914<div style="display:none">~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBlackRockPennsylvaniaMunicipalBondFundClassInvestorA1B1C1BarChart column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="1">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund&#8217;s annual report, which does not include Acquired Fund Fees and Expenses. </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBlackRockNewJerseyMunicipalBondFundClassInvestorA1B1C1BarChart column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">During the ten-year period shown in the bar chart, the highest return for a quarter was 9.14% (quarter ended September 30, 2009) and the lowest return for a quarter was &#8211;5.46% (quarter ended December 31, 2010). The year-to-date return as of June 30, 2012 was 6.77%. </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBlackRockNewJerseyMunicipalBondFundBarChart column period compact * ~</div>
0.086<font style="font-family: ARIAL;" class="_mt" size="2"><b>As of 12/31/11</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>Average Annual Total Returns</b><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Investment Objective </i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Fees and Expenses of the Fund</i></b></font>2012-09-28false0.00250.010.0100.0010.0010.00130.0040.00150.00260.01050.02070.01820.0093<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Investment Objective </i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Investment Objective </i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Fees and Expenses of the Fund</i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Investment Objective </i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Fees and Expenses of the Fund</i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Fees and Expenses of the Fund</i></b></font>00.0450.010<font style="font-family: ARIAL;" class="_mt" size="2"><b>Portfolio Turnover:</b></font>0000774013<center><font style="font-family: ARIAL;" class="_mt" size="2"><b>Service Shares<br/>ANNUAL TOTAL RETURNS</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>BlackRock Pennsylvania Municipal Bond Fund </b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>As of 12/31 </b></font></center><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Investment Objective </i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Investment Objective </i></b></font>0.00250.0103<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Fees and Expenses of the Fund</i></b></font>0.0010.0050.0060.0010.0010.001<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Fees and Expenses of the Fund</i></b></font>0.00140.00170.00130.00910.01340.0140.0505-0.08640.17066495730.0010.0050.006<font style="FONT-FAMILY: ARIAL" size="2">The Fund invests primarily in a portfolio of long term investment grade Pennsylvania municipal bonds. Pennsylvania municipal bonds are debt obligations issued by or on behalf of a governmental entity in Pennsylvania or other qualifying issuer that pay interest that, in the opinion of bond counsel, is excludable from gross income for Federal income tax purposes (except that interest may be includable in taxable income for purposes of the Federal alternative minimum tax) and exempt from Pennsylvania personal income taxes. These may be obligations of a variety of issuers including governmental entities in Pennsylvania and issuers located in Puerto Rico, the U.S. Virgin Islands and Guam. Under normal circumstances, the Fund will invest at least 80% of its assets in Pennsylvania municipal bonds. At least 80% of the Fund&#8217;s assets will be invested in investment grade securities. Investment grade securities are securities which are rated in the four highest categories by at least one of the major rating agencies or determined by the management team to be of similar quality. When choosing investments, Fund management considers various factors, including the credit quality of issuers, yield analysis, maturity analysis and the call features of the obligations. Under normal circumstances, the Fund&#8217;s weighted average maturity will be more than ten years. </font>0.00830.01270.013200.040.01<font style="font-family: ARIAL;" class="_mt" size="2"><b>Portfolio Turnover: </b></font><font style="FONT-FAMILY: ARIAL" size="2">The Fund invests primarily in a portfolio of long term investment grade Pennsylvania municipal bonds. Pennsylvania municipal bonds are debt obligations issued by or on behalf of a governmental entity in Pennsylvania or other qualifying issuer that pay interest that, in the opinion of bond counsel, is excludable from gross income for Federal income tax purposes (except that interest may be includable in taxable income for purposes of the Federal alternative minimum tax) and exempt from Pennsylvania personal income taxes. These may be obligations of a variety of issuers including governmental entities in Pennsylvania and issuers located in Puerto Rico, the U.S. Virgin Islands and Guam. Under normal circumstances, the Fund will invest at least 80% of its assets in Pennsylvania municipal bonds. At least 80% of the Fund&#8217;s assets will be invested in investment grade securities. Investment grade securities are securities which are rated in the four highest categories by at least one of the major rating agencies or determined by the management team to be of similar quality. When choosing investments, Fund management considers various factors, including the credit quality of issuers, yield analysis, maturity analysis and the call features of the obligations. Under normal circumstances, the Fund&#8217;s weighted average maturity will be more than ten years. </font>00.040.01425443<font style="font-family: ARIAL;" class="_mt" size="2"><b>Portfolio Turnover:</b></font>403418<font style="FONT-FAMILY: ARIAL" size="2">The Fund invests primarily in a portfolio of long term investment grade Pennsylvania municipal bonds. Pennsylvania municipal bonds are debt obligations issued by or on behalf of a governmental entity in Pennsylvania or other qualifying issuer that pay interest that, in the opinion of bond counsel, is excludable from gross income for Federal income tax purposes (except that interest may be includable in taxable income for purposes of the Federal alternative minimum tax) and exempt from Pennsylvania personal income taxes. These may be obligations of a variety of issuers including governmental entities in Pennsylvania and issuers located in Puerto Rico, the U.S. Virgin Islands and Guam. Under normal circumstances, the Fund will invest at least 80% of its assets in Pennsylvania municipal bonds. At least 80% of the Fund&#8217;s assets will be invested in investment grade securities. Investment grade securities are securities which are rated in the four highest categories by at least one of the major rating agencies or determined by the management team to be of similar quality. When choosing investments, Fund management considers various factors, including the credit quality of issuers, yield analysis, maturity analysis and the call features of the obligations. Under normal circumstances, the Fund&#8217;s weighted average maturity will be more than ten years. </font>2009-09-30<font style="FONT-FAMILY: ARIAL" size="2">lowest return </font>2010-12-31<font style="FONT-FAMILY: ARIAL" size="2">You would pay the following expenses if you did not redeem your shares: </font>0.0388-0.0753<font style="font-family: ARIAL;" class="_mt" size="2"><b>Portfolio Turnover: </b></font>0.13620.13620.10650.0860.07950.11440.10390.10620.05070.05060.05010.04380.04070.04040.0540.0535<font style="FONT-FAMILY: ARIAL" size="2">The Fund invests primarily in a portfolio of long term investment grade New Jersey municipal bonds. New Jersey municipal bonds are debt obligations issued by or on behalf of a governmental entity in New Jersey or other qualifying issuer that pay interest that, in the opinion of bond counsel, is excludable from gross income for Federal income tax purposes (except that interest may be includable in taxable income for purposes of the Federal alternative minimum tax) and exempt from New Jersey personal income taxes. These bonds may be obligations of a variety of issuers including governmental entities in New Jersey and issuers located in Puerto Rico, the U.S. Virgin Islands and Guam. Under normal circumstances, the Fund will invest at least 80% of its assets in New Jersey municipal bonds. At least 80% of the Fund&#8217;s assets will be invested in investment grade securities. Investment grade securities are securities which are rated in the four highest categories by at least one of the major rating agencies or determined by the management team to be of similar quality. When choosing investments, Fund management considers various factors, including the credit quality of issuers, yield analysis, maturity analysis and the call features of the obligations. Under normal circumstances, the Fund&#8217;s weighted average maturity will be more than ten years. </font><font style="FONT-FAMILY: ARIAL" size="2">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund. </font><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Credit Risk</i></b> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer&#8217;s credit rating or the market&#8217;s perception of an issuer&#8217;s creditworthiness may also affect the value of the Fund&#8217;s investment in that issuer.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Interest Rate Risk</i></b> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Market Risk and Selection Risk</i></b> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Municipal Securities Risks</i></b> &#8212; Municipal securities risks include the ability of the issuer to repay the obligation, the relative lack of information about certain issuers of municipal securities, and the possibility of future legislative changes which could affect the market for and value of municipal securities. These risks include: </font></li></ul><blockquote><font style="FONT-FAMILY: ARIAL" size="2"><i>General Obligation Bonds Risks </i>&#8212; Timely payments depend on the issuer&#8217;s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base. <br/><br/><i>Revenue Bonds Risks </i>&#8212; These payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source.<br/><br/><i>Private Activity Bonds Risks </i>&#8212; Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond, and the issuer does not pledge its faith, credit and taxing power for repayment. <br/><br/><i>Moral Obligation Bonds Risks </i>&#8212; Moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality. <br/><br/><i>Municipal Notes Risks </i>&#8212; Municipal notes are shorter term municipal debt obligations. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and a Fund may lose money. <br/><br/><i>Municipal Lease Obligations Risks </i>&#8212; In a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property. <br/><br/><i>Tax-Exempt Status Risk &#8212; </i>The Fund and its investment manager will rely on the opinion of issuers&#8217; bond counsel and, in the case of derivative securities, sponsors&#8217; counsel, on the tax-exempt status of interest on municipal bonds and payments under derivative securities. Neither the Fund nor its investment manager will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect and subject the Fund and its shareholders to substantial tax liabilities.</font></blockquote><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Prepayment and Extension Risk</i></b> &#8212; When interest rates fall, an issuer may redeem a security with call features by repaying it early, and the Fund may have to invest the proceeds in securities with lower yields. When interest rates rise, certain obligations will be paid off by the issuer more slowly than anticipated, causing the value of these securities to fall. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>State Specific Risk</i></b> &#8212; The Fund will invest primarily in municipal securities issued by or on behalf of the Commonwealth of Pennsylvania. As a result, the Fund is more exposed to risks affecting issuers of Pennsylvania municipal securities than is a municipal securities fund that invests more widely.</font></li></ul>0.11780.11780.09260.10980.10620.05020.05020.04960.0550.0535<font style="FONT-FAMILY: ARIAL" size="2">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. </font>000.00250.010.010.00960.01990.017200.0083<font style="FONT-FAMILY: ARIAL" size="2">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund.</font><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Credit Risk</i></b> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer&#8217;s credit rating or the market&#8217;s perception of an issuer&#8217;s creditworthiness may also affect the value of the Fund&#8217;s investment in that issuer.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Interest Rate Risk</i></b> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Market Risk and Selection Risk</i></b> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Municipal Securities Risks</i></b> &#8212; Municipal securities risks include the ability of the issuer to repay the obligation, the relative lack of information about certain issuers of municipal securities, and the possibility of future legislative changes which could affect the market for and value of municipal securities. These risks include:</font></li></ul><blockquote><font style="FONT-FAMILY: ARIAL" size="2"><i>General Obligation Bonds Risks</i> &#8212; Timely payments depend on the issuer&#8217;s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base.<br/><br/><i>Revenue Bonds Risks</i> &#8212; These payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source.<br/><br/><i>Private Activity Bonds Risks</i> &#8212; Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond, and the issuer does not pledge its faith, credit and taxing power for repayment.<br/><br/><i>Moral Obligation Bonds Risks</i> &#8212; Moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality.<br/><br/><i>Municipal Notes Risks</i> &#8212; Municipal notes are shorter term municipal debt obligations. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and a Fund may lose money.<br/><br/><i>Municipal Lease Obligations Risks</i> &#8212; In a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property.<br/><br/><i>Tax-Exempt Status Risk</i> &#8212; The Fund and its investment manager will rely on the opinion of issuers&#8217; bond counsel and, in the case of derivative securities, sponsors&#8217; counsel, on the tax-exempt status of interest on municipal bonds and payments under derivative securities. Neither the Fund nor its investment manager will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect and subject the Fund and its shareholders to substantial tax liabilities.</font></blockquote><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Prepayment and Extension Risk</i></b> &#8212; When interest rates fall, an issuer may redeem a security with call features by repaying it early, and the Fund may have to invest the proceeds in securities with lower yields. When interest rates rise, certain obligations will be paid off by the issuer more slowly than anticipated, causing the value of these securities to fall.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>State Specific Risk</i></b> &#8212; The Fund will invest primarily in municipal securities issued by or on behalf of the Commonwealth of Pennsylvania. As a result, the Fund is more exposed to risks affecting issuers of Pennsylvania municipal securities than is a municipal securities fund that invests more widely.</font></li></ul><font style="FONT-FAMILY: ARIAL" size="2">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font><center><font style="font-family: ARIAL;" class="_mt" size="2"><b>Investor A1 Shares</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>ANNUAL TOTAL RETURNS </b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>BlackRock Pennsylvania Municipal Bond Fund</b><br/><b>As of 12/31 </b></font></center><font style="font-family: ARIAL;" class="_mt" size="2"><b>Portfolio Turnover: </b></font>0.0369-0.0760.00250.001<font style="FONT-FAMILY: ARIAL" size="2">The Fund invests primarily in a portfolio of long term investment grade New Jersey municipal bonds. New Jersey municipal bonds are debt obligations issued by or on behalf of a governmental entity in New Jersey or other qualifying issuer that pay interest that, in the opinion of bond counsel, is excludable from gross income for Federal income tax purposes (except that interest may be includable in taxable income for purposes of the Federal alternative minimum tax) and exempt from New Jersey personal income taxes. These bonds may be obligations of a variety of issuers including governmental entities in New Jersey and issuers located in Puerto Rico, the U.S. Virgin Islands and Guam. Under normal circumstances, the Fund will invest at least 80% of its assets in New Jersey municipal bonds. At least 80% of the Fund&#8217;s assets will be invested in investment grade securities. Investment grade securities are securities which are rated in the four highest categories by at least one of the major rating agencies or determined by the management team to be of similar quality. When choosing investments, Fund management considers various factors, including the credit quality of issuers, yield analysis, maturity analysis and the call features of the obligations. Under normal circumstances, the Fund&#8217;s weighted average maturity will be more than ten years. </font>0.0020.011200.0450.01<font style="FONT-FAMILY: ARIAL" size="2">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund. </font><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Credit Risk </i></b>&#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer&#8217;s credit rating or the market&#8217;s perception of an issuer&#8217;s creditworthiness may also affect the value of the Fund&#8217;s investment in that issuer. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Interest Rate Risk </i></b>&#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Market Risk and Selection Risk </i></b>&#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Municipal Securities Risks </i></b>&#8212; Municipal securities risks include the ability of the issuer to repay the obligation, the relative lack of information about certain issuers of municipal securities, and the possibility of future legislative changes which could affect the market for and value of municipal securities. These risks include: </font></li></ul><blockquote><font style="FONT-FAMILY: ARIAL" size="2"><i>General Obligation Bonds Risks </i>&#8212; Timely payments depend on the issuer&#8217;s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base.<br /><br /><i>Revenue Bonds Risks </i>&#8212; These payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source.<br /><br /><i>Private Activity Bonds Risks </i>&#8212; Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond, and the issuer does not pledge its faith, credit and taxing power for repayment.<br /><br /><i>Moral Obligation Bonds Risks </i>&#8212; Moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality.<br /><br /><i>Municipal Notes Risks </i>&#8212; Municipal notes are shorter term municipal debt obligations. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and a Fund may lose money.<br /><br /><i>Municipal Lease Obligations Risks </i>&#8212; In a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property.<br /><br /><i>Tax-Exempt Status Risk &#8212; </i>The Fund and its investment manager will rely on the opinion of issuers&#8217; bond counsel and, in the case of derivative securities, sponsors&#8217; counsel, on the tax-exempt status of interest on municipal bonds and payments under derivative securities. Neither the Fund nor its investment manager will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect and subject the Fund and its shareholders to substantial tax liabilities.</font></blockquote><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk </i></b>&#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Prepayment and Extension Risk</i></b> &#8212; When interest rates fall, an issuer may redeem a security with call features by repaying it early, and the Fund may have to invest the proceeds in securities with lower yields. When interest rates rise, certain obligations will be paid off by the issuer more slowly than anticipated, causing the value of these securities to fall. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>State Specific Risk </i></b>&#8212; The Fund will invest primarily in municipal securities issued by or on behalf of the State of New Jersey. As a result, the Fund is more exposed to risks affecting issuers of New Jersey municipal securities than is a municipal securities fund that invests more widely. </font></li></ul>0.13430.13430.10430.10390.10620.04840.04830.04790.0540.05350.0511-0.08582009-09-30<font style="FONT-FAMILY: ARIAL" size="2">lowest return </font>2010-12-310.09060.09060.07580.09040.11920.10390.10620.04560.04550.04550.04560.04450.0540.05352009-09-30<center><font style="font-family: ARIAL;" class="_mt" size="2"><b>Institutional Shares</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>ANNUAL TOTAL RETURNS </b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>BlackRock Pennsylvania Municipal Bond Fund</b><br/><b>As of 12/31 </b></font></center><font style="FONT-FAMILY: ARIAL" size="2">You would pay the following expenses if you did not redeem your shares: </font><font style="FONT-FAMILY: ARIAL" size="2">lowest return</font>2010-12-31624542<font style="FONT-FAMILY: ARIAL" size="2">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund. </font> <ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Credit Risk</i></b> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer&#8217;s credit rating or the market&#8217;s perception of an issuer&#8217;s creditworthiness may also affect the value of the Fund&#8217;s investment in that issuer. </font></li></ul> <ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Interest Rate Risk</i></b> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise. </font></li></ul> <ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Market Risk and Selection Risk</i></b> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money. </font></li></ul> <ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Municipal Securities Risks</i></b> &#8212; Municipal securities risks include the ability of the issuer to repay the obligation, the relative lack of information about certain issuers of municipal securities, and the possibility of future legislative changes which could affect the market for and value of municipal securities. These risks include: </font></li></ul> <blockquote> <font style="FONT-FAMILY: ARIAL" size="2"><i>General Obligation Bonds Risks</i> &#8212; Timely payments depend on the issuer&#8217;s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base. </font><br/><br/> <font style="FONT-FAMILY: ARIAL" size="2"><i>Revenue Bonds Risks</i> &#8212; These payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source. </font><br/><br/> <font style="FONT-FAMILY: ARIAL" size="2"><i>Private Activity Bonds Risks</i> &#8212; Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond, and the issuer does not pledge its faith, credit and taxing power for repayment. </font><br/><br/> <font style="FONT-FAMILY: ARIAL" size="2"><i>Moral Obligation Bonds Risks</i> &#8212; Moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality. </font><br/><br/> <font style="FONT-FAMILY: ARIAL" size="2"><i>Municipal Notes Risks</i> &#8212; Municipal notes are shorter term municipal debt obligations. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and a Fund may lose money. </font><br/><br/> <font style="FONT-FAMILY: ARIAL" size="2"><i>Municipal Lease Obligations Risks</i> &#8212; In a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property. </font><br/><br/> <font style="FONT-FAMILY: ARIAL" size="2"><i>Tax-Exempt Status Risk &#8212; </i>The Fund and its investment manager will rely on the opinion of issuers&#8217; bond counsel and, in the case of derivative securities, sponsors&#8217; counsel, on the tax-exempt status of interest on municipal bonds and payments under derivative securities. Neither the Fund nor its investment manager will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect and subject the Fund and its shareholders to substantial tax liabilities. </font> </blockquote> <ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely. </font></li></ul> <ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Prepayment and Extension Risk </i></b>&#8212; When interest rates fall, an issuer may redeem a security with call features by repaying it early, and the Fund may have to invest the proceeds in securities with lower yields. When interest rates rise, certain obligations will be paid off by the issuer more slowly than anticipated, causing the value of these securities to fall. </font></li></ul> <ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>State Specific Risk</i></b> &#8212; The Fund will invest primarily in municipal securities issued by or on behalf of the State of New Jersey. As a result, the Fund is more exposed to risks affecting issuers of New Jersey municipal securities than is a municipal securities fund that invests more widely. </font></li></ul><center><font style="font-family: ARIAL;" class="_mt" size="2"><b>Investor A1 Shares</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>ANNUAL TOTAL RETURNS </b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>BlackRock New Jersey Municipal Bond Fund </b><br/><b>As of 12/31 </b></font></center><font style="FONT-FAMILY: ARIAL" size="2">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font><font style="font-family: ARIAL;" class="_mt" size="2"><b>Portfolio Turnover: </b></font><font style="FONT-FAMILY: ARIAL" size="2">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund.</font><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Credit Risk</i></b> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer&#8217;s credit rating or the market&#8217;s perception of an issuer&#8217;s creditworthiness may also affect the value of the Fund&#8217;s investment in that issuer. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Interest Rate Risk</i></b> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Market Risk and Selection Risk</i></b> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Municipal Securities Risks</i></b> &#8212; Municipal securities risks include the ability of the issuer to repay the obligation, the relative lack of information about certain issuers of municipal securities, and the possibility of future legislative changes which could affect the market for and value of municipal securities. These risks include: </font></li></ul><blockquote><font style="FONT-FAMILY: ARIAL" size="2"><i>General Obligation Bonds Risks </i>&#8212; Timely payments depend on the issuer&#8217;s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base. <br/><br/><i>Revenue Bonds Risks </i>&#8212; These payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source.<br/><br/><i>Private Activity Bonds Risks </i>&#8212; Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond, and the issuer does not pledge its faith, credit and taxing power for repayment. <br/><br/><i>Moral Obligation Bonds Risks </i>&#8212; Moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality. <br/><br/><i>Municipal Notes Risks </i>&#8212; Municipal notes are shorter term municipal debt obligations. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and a Fund may lose money. <br/><br/><i>Municipal Lease Obligations Risks </i>&#8212; In a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property. <br/><br/><i>Tax-Exempt Status Risk &#8212; </i>The Fund and its investment manager will rely on the opinion of issuers&#8217; bond counsel and, in the case of derivative securities, sponsors&#8217; counsel, on the tax-exempt status of interest on municipal bonds and payments under derivative securities. Neither the Fund nor its investment manager will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect and subject the Fund and its shareholders to substantial tax liabilities.</font></blockquote><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Prepayment and Extension Risk</i></b> &#8212; When interest rates fall, an issuer may redeem a security with call features by repaying it early, and the Fund may have to invest the proceeds in securities with lower yields. When interest rates rise, certain obligations will be paid off by the issuer more slowly than anticipated, causing the value of these securities to fall. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>State Specific Risk</i></b> &#8212; The Fund will invest primarily in municipal securities issued by or on behalf of the Commonwealth of Pennsylvania. As a result, the Fund is more exposed to risks affecting issuers of Pennsylvania municipal securities than is a municipal securities fund that invests more widely.</font></li></ul><font style="FONT-FAMILY: ARIAL" size="2">The Fund invests primarily in a portfolio of long term investment grade New Jersey municipal bonds. New Jersey municipal bonds are debt obligations issued by or on behalf of a governmental entity in New Jersey or other qualifying issuer that pay interest that, in the opinion of bond counsel, is excludable from gross income for Federal income tax purposes (except that interest may be includable in taxable income for purposes of the Federal alternative minimum tax) and exempt from New Jersey personal income taxes. These bonds may be obligations of a variety of issuers including governmental entities in New Jersey and issuers located in Puerto Rico, the U.S. Virgin Islands and Guam. Under normal circumstances, the Fund will invest at least 80% of its assets in New Jersey municipal bonds. At least 80% of the Fund&#8217;s assets will be invested in investment grade securities. Investment grade securities are securities which are rated in the four highest categories by at least one of the major rating agencies or determined by the management team to be of similar quality. When choosing investments, Fund management considers various factors, including the credit quality of issuers, yield analysis, maturity analysis and the call features of the obligations. Under normal circumstances, the Fund&#8217;s weighted average maturity will be more than ten years. </font><center><font style="font-family: ARIAL;" class="_mt" size="2"><b>Service Shares</b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>ANNUAL TOTAL RETURNS </b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>BlackRock New Jersey Municipal Bond Fund</b><br/><b>As of 12/31 </b></font></center><font style="FONT-FAMILY: ARIAL" size="2">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font><font style="FONT-FAMILY: ARIAL" size="2">However, the table includes all applicable fees and sales charges.</font>0.07460.07460.06450.07490.10380.10980.10620.04760.04760.04720.04760.04670.0550.0535<font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.</font><font style="FONT-FAMILY: ARIAL" size="2">However, the table includes all applicable fees and sales charges.</font><font style="FONT-FAMILY: ARIAL" size="2">However, the table includes all applicable fees and sales charges.</font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.</font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.</font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are shown for Investor A1 Shares only, and the after-tax returns for Investor B1 and Investor C1 Shares will vary. </font><font style="FONT-FAMILY: ARIAL" size="2">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund. </font><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Credit Risk</i></b> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer&#8217;s credit rating or the market&#8217;s perception of an issuer&#8217;s creditworthiness may also affect the value of the Fund&#8217;s investment in that issuer. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Interest Rate Risk</i></b> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Market Risk and Selection Risk</i></b> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Municipal Securities Risks</i></b> &#8212; Municipal securities risks include the ability of the issuer to repay the obligation, the relative lack of information about certain issuers of municipal securities, and the possibility of future legislative changes which could affect the market for and value of municipal securities. These risks include: </font></li></ul><blockquote><font style="FONT-FAMILY: ARIAL" size="2"><i>General Obligation Bonds Risks</i> &#8212; Timely payments depend on the issuer&#8217;s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base.<br/><br/><i>Revenue Bonds Risks</i> &#8212; These payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source. <br/><br/><i>Private Activity Bonds Risks</i> &#8212; Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond, and the issuer does not pledge its faith, credit and taxing power for repayment. <br/><br/><i>Moral Obligation Bonds Risks</i> &#8212; Moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality. <br/><br/><i>Municipal Notes Risks</i> &#8212; Municipal notes are shorter term municipal debt obligations. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and a Fund may lose money. <br/><br/><i>Municipal Lease Obligations Risks</i> &#8212; In a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property. <br/><br/><i>Tax-Exempt Status Risk</i> &#8212; The Fund and its investment manager will rely on the opinion of issuers&#8217; bond counsel and, in the case of derivative securities, sponsors&#8217; counsel, on the tax-exempt status of interest on municipal bonds and payments under derivative securities. Neither the Fund nor its investment manager will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect and subject the Fund and its shareholders to substantial tax liabilities. </font> </blockquote><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Non-Diversification Risk</i></b> &#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>Prepayment and Extension Risk</i></b> &#8212; When interest rates fall, an issuer may redeem a security with call features by repaying it early, and the Fund may have to invest the proceeds in securities with lower yields. When interest rates rise, certain obligations will be paid off by the issuer more slowly than anticipated, causing the value of these securities to fall. </font></li></ul><ul type="square"><li><font style="FONT-FAMILY: ARIAL" size="2"><b><i>State Specific Risk</i></b> &#8212; The Fund will invest primarily in municipal securities issued by or on behalf of the State of New Jersey. As a result, the Fund is more exposed to risks affecting issuers of New Jersey municipal securities than is a municipal securities fund that invests more widely. </font></li></ul>2009-09-30<font style="FONT-FAMILY: ARIAL" size="2">lowest return</font>2010-12-31<font style="FONT-FAMILY: ARIAL" size="2">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font><center><font style="font-family: ARIAL;" class="_mt" size="2"><b>Institutional Shares </b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>ANNUAL TOTAL RETURNS </b></font><br/><font style="font-family: ARIAL;" class="_mt" size="2"><b>BlackRock New Jersey Municipal Bond Fund </b><br/><b>As of 12/31 </b></font></center><font style="FONT-FAMILY: ARIAL" size="2">However, the table includes all applicable fees and sales charges.</font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.</font><font style="FONT-FAMILY: ARIAL" size="2">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. </font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are shown for Institutional Shares only, and the after-tax returns for Investor A, Investor B and Investor C Shares will vary.</font>0.0362-0.07720.0531-0.0848<div style="display:none">~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackRockNewJerseyMunicipalBondFundClassServiceshare column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">However, the table includes all applicable fees and sales charges.</font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.</font><font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are shown for Investor A1 Shares only, and the after-tax returns for Investor B1 and Investor C1 Shares will vary. </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackRockPennsylvaniaMunicipalBondFund column period compact * ~</div>
<div style="display:none">~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackRockPennsylvaniaMunicipalBondFund column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackRockPennsylvaniaMunicipalBondFundClassServiceShares column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2"> After-tax returns are shown for Institutional Shares only, and the after-tax returns for Investor A, Investor B and Investor C Shares will vary. </font>2009-09-30<font style="FONT-FAMILY: ARIAL" size="2">lowest return </font>2010-12-31<font style="FONT-FAMILY: ARIAL" size="2">You will pay the following expenses if you do not redeem your shares: </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackRockPennsylvaniaMunicipalBondFundClassInvestorA1B1C1 column period compact * ~</div>
0.12050.12040.09520.07020.06430.09830.10980.10620.05250.05250.05170.04570.04240.04230.0550.0535<div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackRockNewJerseyMunicipalBondFundClassInvestorA1B1C1 column period compact * ~</div>
<div style="display:none">~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackRockNewJerseyMunicipalBondFundClassInvestorA1B1C1 column period compact * ~</div>
0<div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackRockPennsylvaniaMunicipalBondFundClassInvestorA1B1C1 column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">You would pay the following expenses if you did not redeem your shares: </font><div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackRockNewJerseyMunicipalBondFund column period compact * ~</div>
<div style="display:none">~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackRockNewJerseyMunicipalBondFund column period compact * ~</div>
2009-09-30<font style="FONT-FAMILY: ARIAL" size="2">lowest return</font>2010-12-31<font style="FONT-FAMILY: ARIAL" size="2"> However, the table includes all applicable fees and sales charges.</font><font style="FONT-FAMILY: ARIAL" size="2">The investment objective of BlackRock Pennsylvania Municipal Bond Fund (the &#8220;Pennsylvania Fund&#8221; or the &#8220;Fund&#8221;) is to provide shareholders with income exempt from Federal income tax and Pennsylvania personal income taxes.</font>2012-09-280.00550.00550.00550.00550.00230.0050.00250.00360.00020.00020.00020.0002<font style="FONT-FAMILY: ARIAL" size="2">The investment objective of BlackRock Pennsylvania Municipal Bond Fund (the &#8220;Pennsylvania Fund&#8221; or the &#8220;Fund&#8221;) is to provide shareholders with income exempt from Federal income tax and Pennsylvania personal income taxes. </font><font style="FONT-FAMILY: ARIAL" size="2">The investment objective of BlackRock New Jersey Municipal Bond Fund (the &#8220;New Jersey Fund&#8221; or the &#8220;Fund&#8221;) is to provide shareholders with income exempt from Federal income tax and New Jersey personal income taxes. </font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Risks of Investing in the Fund</i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Performance Information </i></b></font>0.00550.00220.0001<font style="FONT-FAMILY: ARIAL" size="2">The investment objective of BlackRock New Jersey Municipal Bond Fund (the &#8220;New Jersey Fund&#8221; or the &#8220;Fund&#8221;) is to provide shareholders with income exempt from Federal income tax and New Jersey personal income taxes. </font>0.0055<font style="FONT-FAMILY: ARIAL" size="2">The investment objective of BlackRock New Jersey Municipal Bond Fund (the &#8220;New Jersey Fund&#8221; or the &#8220;Fund&#8221;) is to provide shareholders with income exempt from Federal income tax and New Jersey personal income taxes. </font>0.00550.00550.00240.00270.002312590.00020.00020.00020.05080.05880.00840.02151653213720151143<font style="FONT-FAMILY: ARIAL" size="2">The investment objective of BlackRock Pennsylvania Municipal Bond Fund (the &#8220;Pennsylvania Fund&#8221; or the &#8220;Fund&#8221;) is to provide shareholders with income exempt from Federal income tax and Pennsylvania personal income taxes. </font>0.00550.00550.00550.00170.00210.00160.00010.00010.00010.24<font style="FONT-FAMILY: ARIAL" size="2">The information shows you how the Fund&#8217;s performance has varied year by year and provides some indication of the risks of investing in the Fund. The returns for Service Shares prior to October 2, 2006, the commencement of operations of Service Shares, are based upon performance of the Fund&#8217;s Institutional Shares. The returns for Service Shares, however, are adjusted to reflect the service (12b-1) fees applicable to Service Shares. The table compares the Fund&#8217;s performance to that of the S&amp;P Pennsylvania Municipal Bond Index and the S&amp;P Municipal Bond Index. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund&#8217;s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund&#8217;s returns would have been lower. Updated information on the Fund&#8217;s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052. </font>147516131680<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Risks of Investing in the Fund</i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Performance Information </i></b></font><font style="FONT-FAMILY: ARIAL" size="2">The information shows you how the Fund&#8217;s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund&#8217;s performance to that of the S&amp;P Pennsylvania Municipal Bond Index and the S&amp;P Municipal Bond Index. Prior to the Investor A, Investor B and Investor C Shares inception date of October 2, 2006, the returns for Investor A, Investor B and Investor C Shares are based upon performance of the Fund&#8217;s Institutional Shares. The returns for Investor A, Investor B and Investor C Shares, however, are adjusted to reflect the distribution and service (12b-1) fees applicable to such shares. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund&#8217;s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund&#8217;s returns would have been lower. Updated information on the Fund&#8217;s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052. </font>0.24<font style="FONT-FAMILY: ARIAL" size="2">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>138415341590<font style="FONT-FAMILY: ARIAL" size="2">year-to-date return </font><font style="FONT-FAMILY: ARIAL" size="2">highest return </font>-0.0657<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Risks of Investing in the Fund</i></b></font>0.04110.05140.01790.16180.00610.04560.04540.04540.03450.03270.03530.05020.0486<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Risks of Investing in the Fund</i></b></font>0.04250.04240.04240.04880.0486<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Performance Information </i></b></font><font style="FONT-FAMILY: ARIAL" size="2">The information shows you how the Fund&#8217;s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund&#8217;s performance to that of the S&amp;P Pennsylvania Municipal Bond Index and the S&amp;P Municipal Bond Index. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund&#8217;s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund&#8217;s returns would have been lower. Updated information on the Fund&#8217;s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052. </font>0.00550.00550.00550.00160.00430.00150.00010.00010.00010.00550.0027<font style="FONT-FAMILY: ARIAL" size="2">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>0.00010.04010.180.05040.01690.00550.0030.16130.0060.00021363<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Performance Information </i></b></font><font style="FONT-FAMILY: ARIAL" size="2">The information shows you how the Fund&#8217;s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund&#8217;s performance to that of the S&amp;P New Jersey Municipal Bond Index and the S&amp;P Municipal Bond Index. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund&#8217;s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund&#8217;s returns would have been lower. Updated information on the Fund&#8217;s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052. </font>0.04370.04340.04340.05020.04860.05240.06230.00990.1722<font style="FONT-FAMILY: ARIAL" size="2">year-to-date return </font>0.0231<font style="FONT-FAMILY: ARIAL" size="2">highest return </font>-0.06570.03660.03640.03740.03740.03960.05020.0486<font style="FONT-FAMILY: ARIAL" size="2">year-to-date return</font>1553192520301025<font style="FONT-FAMILY: ARIAL" size="2">highest return</font>-0.0546<font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Risks of Investing in the Fund </i></b></font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Performance Information</i></b></font>0.18<font style="FONT-FAMILY: ARIAL" size="2">The information shows you how the Fund&#8217;s performance has varied year by year and provides some indication of the risks of investing in the Fund. The returns for Service Shares prior to October 2, 2006, the commencement of operations of Service Shares, are based upon performance of the Fund&#8217;s Institutional Shares. The returns for Service Shares, however, are adjusted to reflect the service (12b-1) fees applicable to Service Shares. The table compares the Fund&#8217;s performance to that of the S&amp;P New Jersey Municipal Bond Index and the S&amp;P Municipal Bond Index. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund&#8217;s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund&#8217;s returns would have been lower. Updated information on the Fund&#8217;s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052. </font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Principal Risks of Investing in the Fund</i></b></font><font style="FONT-FAMILY: ARIAL" size="2">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>0.24<font style="FONT-FAMILY: ARIAL" size="2">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font><font style="FONT-FAMILY: ARIAL" size="2">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font><font style="FONT-FAMILY: ARIAL" size="2">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>0.03540.03530.03630.03630.03860.04880.0486<font style="FONT-FAMILY: ARIAL" size="2">highest return</font>-0.055<font style="FONT-FAMILY: ARIAL" size="2">year-to-date return </font><font style="FONT-FAMILY: ARIAL" size="2">The information shows you how the Fund&#8217;s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund&#8217;s performance to that of the S&amp;P New Jersey Municipal Bond Index and the S&amp;P Municipal Bond Index. Prior to the Investor A, Investor B and Investor C Shares inception date of October 2, 2006, the returns for Investor A, Investor B and Investor C Shares are based upon performance of the Fund&#8217;s Institutional Shares. The returns for Investor A, Investor B and Investor C Shares, however, are adjusted to reflect the distribution and service (12b-1) fees applicable to such shares. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund&#8217;s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund&#8217;s returns would have been lower. Updated information on the Fund&#8217;s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052. </font><font style="font-family: ARIAL;" class="_mt" size="3"><b><i>Performance Information </i></b></font>0.18<font style="FONT-FAMILY: ARIAL" size="2">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font><div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackRockNewJerseyMunicipalBondFundClassServiceshare column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2"> As with all such investments, past performance (before and after taxes) is not an indication of future results.</font><font style="FONT-FAMILY: ARIAL" size="2">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font><font style="FONT-FAMILY: ARIAL" size="2">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>0.03850.04880.01540.05340.15960.06240.00470.00970.1720.0233<div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackRockPennsylvaniaMunicipalBondFund column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font><div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackRockPennsylvaniaMunicipalBondFundClassServiceShares column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">year-to-date return </font><font style="FONT-FAMILY: ARIAL" size="2">highest return </font>-0.0544<div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackRockPennsylvaniaMunicipalBondFundClassInvestorA1B1C1 column period compact * ~</div>
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0.04430.04420.04420.03330.0310.04880.03440.0486<div style="display:none">~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackRockNewJerseyMunicipalBondFund column period compact * ~</div>
<font style="FONT-FAMILY: ARIAL" size="2">year-to-date return</font><font style="FONT-FAMILY: ARIAL" size="2">highest return</font>-0.0663<font style="FONT-FAMILY: ARIAL" size="2">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.The CDSC is 4.50% if shares are redeemed in less than one year. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes - Investor B Shares" for the complete schedule of CDSCs.)There is no CDSC on Investor C Shares after one year.The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's annual report, which does not include Acquired Fund Fees and Expenses.The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report, which does not include Acquired Fund Fees and Expenses.A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A1 Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.There is no CDSC on Investor C1 Shares after one year.The CDSC is 4.00% if shares are redeemed in less than two years. The CDSC for Investor B1 Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B1 Shares. (See the section "Details about the Share Classes - Investor B1 Shares" for the complete schedule of CDSCs.)EX-101.SCH
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Schedule - Average Annual Total Returns {Transposed} - {BlackRock New Jersey Municipal Bond Fund Class Service share}link:presentationLinklink:calculationLinklink:definitionLink000038 - Document - Risk/Return Detail {Unlabeled} - BlackRock New Jersey Municipal Bond Fund Class Service sharelink:presentationLinklink:calculationLinklink:definitionLink000039 - Disclosure - Risk/Return Detail Data {Elements} - (BlackRock New Jersey Municipal Bond Fund) (Service Share)link:presentationLinklink:calculationLinklink:definitionLink000041 - Document - Risk/Return Summary {Unlabeled} - (BlackRock Pennsylvania Municipal Bond Fund) (Service Shares)link:presentationLinklink:calculationLinklink:definitionLink000042 - Schedule - Shareholder Fees - {BlackRock Pennsylvania Municipal Bond Fund Class Service Shares}link:presentationLinklink:calculationLinklink:definitionLink000043 - Schedule - Annual Fund Operating Expenses - {BlackRock Pennsylvania Municipal Bond Fund Class Service Shares}link:presentationLinklink:calculationLinklink:definitionLink000044 - Schedule - Expense Example {Transposed} - {BlackRock Pennsylvania Municipal Bond Fund Class Service Shares}link:presentationLinklink:calculationLinklink:definitionLink000045 - Schedule - Expense Example, No Redemption {Transposed} - BlackRock Pennsylvania Municipal Bond Fund Class Service Shareslink:presentationLinklink:calculationLinklink:definitionLink000046 - Schedule - Annual Total Returns - {BlackRock Pennsylvania Municipal Bond Fund Class Service Shares [BarChart]}link:presentationLinklink:calculationLinklink:definitionLink000047 - Schedule - Average Annual Total Returns {Transposed} - {BlackRock Pennsylvania Municipal Bond Fund Class Service Shares}link:presentationLinklink:calculationLinklink:definitionLink000048 - Document - Risk/Return Detail {Unlabeled} - BlackRock Pennsylvania Municipal Bond Fund Class Service Shareslink:presentationLinklink:calculationLinklink:definitionLink000049 - Disclosure - Risk/Return Detail Data {Elements} - (BlackRock Pennsylvania Municipal Bond Fund) (Service Shares)link:presentationLinklink:calculationLinklink:definitionLink000051 - Document - Risk/Return Summary {Unlabeled} - (BlackRock New Jersey Municipal Bond Fund) (Prime Shares)link:presentationLinklink:calculationLinklink:definitionLink000052 - Schedule - Shareholder Fees - {BlackRock New Jersey Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000053 - Schedule - Annual Fund Operating Expenses - {BlackRock New Jersey Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000054 - Schedule - Expense Example {Transposed} - {BlackRock New Jersey Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000055 - Schedule - Expense Example, No Redemption {Transposed} - {BlackRock New Jersey Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000056 - Schedule - Annual Total Returns - BlackRock New Jersey Municipal Bond Fund Class Investor A1 B1 C1 [BarChart]link:presentationLinklink:calculationLinklink:definitionLink000057 - Schedule - Average Annual Total Returns {Transposed} - {BlackRock New Jersey Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000058 - Document - Risk/Return Detail {Unlabeled} - BlackRock New Jersey Municipal Bond Fund Class Investor A1 B1 C1link:presentationLinklink:calculationLinklink:definitionLink000059 - Disclosure - Risk/Return Detail Data {Elements} - (BlackRock New Jersey Municipal Bond Fund) (Prime Shares)link:presentationLinklink:calculationLinklink:definitionLink000061 - Document - Risk/Return Summary {Unlabeled} - (BlackRock Pennsylvania Municipal Bond Fund) (Prime Shares)link:presentationLinklink:calculationLinklink:definitionLink000062 - Schedule - Shareholder Fees - {BlackRock Pennsylvania Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000063 - Schedule - Annual Fund Operating Expenses - {BlackRock Pennsylvania Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000064 - Schedule - Expense Example {Transposed} - {BlackRock Pennsylvania Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000065 - Schedule - Expense Example, No Redemption {Transposed} - {BlackRock Pennsylvania Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000066 - Schedule - Annual Total Returns - BlackRock Pennsylvania Municipal Bond Fund Class Investor A1 B1 C1 [BarChart]link:presentationLinklink:calculationLinklink:definitionLink000067 - Schedule - Average Annual Total Returns {Transposed} - {BlackRock Pennsylvania Municipal Bond Fund Class Investor A1 B1 C1}link:presentationLinklink:calculationLinklink:definitionLink000068 - Document - Risk/Return Detail {Unlabeled} - BlackRock Pennsylvania Municipal Bond Fund Class Investor A1 B1 C1link:presentationLinklink:calculationLinklink:definitionLink000069 - Disclosure - Risk/Return Detail Data {Elements} - (BlackRock Pennsylvania Municipal Bond Fund) (Prime Shares)link:presentationLinklink:calculationLinklink:definitionLinkEX-101.CAL
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bmsmst1-20120925_cal.xml
XBRL TAXONOMY EXTENSION CALCULATION LINKBASE
EX-101.DEF
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bmsmst1-20120925_def.xml
XBRL TAXONOMY EXTENSION DEFINITION LINKBASE